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|  DSH 716
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( H! E# v( I7 z | Probe impedance for plug discharge test- V, g* ]1 I& Y* M! ?- ^6 O: S2 ?/ i
| 9.1.6 (IEC 60065) 22.5 (IEC 60335) 2.1.1.7 (IEC 60950) 6.1.2, 6.10.3 (IEC 61010) + any other as applicable2 g3 @7 \! b. W& N. k3 g2 x; J8 A
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, a5 j. u0 u8 B- H" e0 k! _Question:
1 j. h# e) S7 d8 }When the plug discharge test is performed using a voltage probe and oscilloscope for direct measurement of the voltage decay, what probe impedance shall be used to ensure uniform and comparable results?
5 {4 z# w% Z5 mNote: IEC 60950-1/2005 specifies 100 M ± 5 M in parallel with an input capacitance of 20pF ± 5 pF.( J ~* N" h( Y
Decision:, q k. q9 \# p8 T [+ k: u7 D
If the relevant standard does not contain contradictory requirements, a voltage probe having an input impedance of 100 M or greater in parallel with an input capacitance of 25 pF or less, shall be used for this test.0 M# M$ ]3 `3 F$ Y$ o' ^
For other (automatic) equipment with special measurement techniques equivalent measures shall be taken to ensure comparable results.
& x; `6 O- ] T9 `# q0 @0 F+ Q- X4 g- V. \0 G( {( B2 S) J
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发表于 2012-9-8 13:00
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